I have an idea for teaching my beginning brass class. I'd like to have them make an instrument out of a piece of tubing and a funnel. My question is what kind of tubing would work best, how long should it be, and how can I differentiate between trumpets and trombones? My plan is to spend the first week of school teaching air, buzzing, and rhythm then adding the horn in the second week. I see my students every day for 50 minutes. Thanks for any advice.